State Route 970

When the current state highway numbering system was first posted in January
1964, the SR 970 designation was not used. In 1975, US 97
from I-90 Exit 85 near Cle Elum to Jct SR 131 at Virden was redesignated
SR 970. SR 131 from Virden to Ellensburg became US 97.
SR 970 is 10.31 miles long